Machine tool



June 17, 1930. H. E. MAYNARD BRAKE SHOE y atthe open side onf whigchfis Y so Patented June 17, 1930 UNITED STATES PATENT OFFICE HOWARD E. MAYNARD, 0F DETROIT, MICHIGAN, ASSIGNOR TO CHRYSLER CORPORA- TION, OF DETROIT, MICHIGAN, A. CORPORATION OF DELAWARE BRAKE SHOE Application led May 23,

This invention relates to brake shoes, and is illustrated as embodied in novel pressed metal shoes for an internal expanding automobile brake.

An object of the invention is to increase the strength of the brake shoes, and espe-- cially to do so in a manner permitting them to be made more cheaply, as for example from sheet metal stampings.

Having this object in mind, an important feature of the invention relates to forming the brake shoe with a body generally T shaped in section, preferably formed from angle members welded together. One an e Vof each angle member is cylindrical and orms a part of the friction lining support and the other adjacent anges of the angle members form the stiiening web.

Another objectief the invention is to provide stamped out ortions inthe stiiiening web to strengthen 1t. The stamped out portions are shown in the form of adacent grooves which when put together form a cylindrical rib.

A further Vobject. of the invention is I .provide: tubular anges on oneof the ilanges forming the stiiening web which are received in openings inthe other tienl vofthe sti'ening web. This is particular y desirablel for assemblingthe two angie members for weldlng.

vOther objects and features of the inventionincluding various desirable details of construction will be apparent from the foliowing description of one illustrative ernidiment-shown m the accompanying drawings, inV which:

Fig'. 1Y is a vertical section through the brake just inside the head ofthe drum, showing the shoes in side elevation and the oper. ating Imiehanism in section.

, Fig. 2 is a side elevation of one of the brake shoes.

Figfis a plan view of the brake shoe Vshown in Fig.' 2.

Fig: ai 2 is asectional view on line 4-4 of and 142iV are *two brake f' comprises a drum 10, a backing' plate v 1925. Serial No. 279,893.

shoes 14 and 16. The shoe 14 is 'pivoted as at 18 on the plate 12 and the other shoe 16 is ivoted as at 20.

he control for the shoes shown is of the hydraulic typefoperating b means such as 58 a pair ofop" itely movab e pistons 22 reciprocating 1n a cylinder 24. The ends of the shoes, opposite their vot points Vengage the pistons 22. The braga is applis by appiyinga finiti pressure in the cylinder 24 6b between the two pistons so that movement of `,the-pistons forces the shoes 14 and 16 against the dnuml() against the resistance o a," V ring 262' The free ends of the shoes 14 an 16 are provided with piston engaging end portions 28 and grooves 30; the latter receivin iiexible covers 32, enclosing the open en s ofthe cylinder 24. Y

`'ll-ie Vgeneral construction of eaciilbrake w i shoe consists'of a" pair 'of anglexnelnbrs -34 7b eachhavi'n' a cyilnldrical later-agi flange '36' anda raiiia iiange 38. The angie meiniiersVV axeformjedtcyiindrical to fit the innerpe' Ifiheryofgtiiefbrakepdrum. 'p

eradiaIfiange '38l on one ofthe-angle meinem':siepasividadwithapluraizoitiihi-l Y i lai-'flanges tH )adajipted to'be receir" [ino gens ings;l}42 `i1l`1"theifdther -angjle mensw.' si 'ach y ;-V an'geis 'also provideziwitli "a lontIV 'portion-'44 in -i',i1e""formv off-pa Y Y oves-have-beenso arra'vwhenft ve angle members areptfto the grooves coincide forini'ng'fa channel iliproximately the'fenti eil the cylin 'cal iianges 36l andpwh v Y eraliy a direction with thecy Topposite ends ofjradial fianges each extendedbe `omithe entisef'A drical flanges g: t 'e' one elidqfp-l oppositely extended-'tabular form avr-'bearing for theipivo 8o 2Q thai-other endpmvidedwitlrth an 13155011 @Il '11 i rQI-IZS It wing-be the t; members arejplfacedlbaek wi tubular 1 j h une :niembe' P The assembly is then electricall welded at its outer edges as at 48. A bra e lining 50 is secured as by rivets 52 to the fianges 36.

Stamped angle members assembled in such a a manner provide a strong and li ht weight shoe which maybe readily assem 1ed. 4

It willbe obvious that various changes i11- oludingthe size and arrangement of parts may be made without departing from the 10 spirit of'my inventionfad 1t is not vmy intention-to limititsseopother-than by the terms of the appended claims.

WhatI claim is: l1. Abrake shoec .mprisin apairfofangle 15 members each havin a o linrical flange and aradial flange, tubnl aranges onone of said radial Hauses adapted te be'reivedin openngsin the other of said radiallflangesland Stamped ont E portions on 4each of said radial zo. =--,flanges terminare-groove, Seid'sr0le-xtnd'- :in -sapproximatelygthejulle;'length'ofgsaid emrwelngeone'fto winnidew-ith,N the o we when the ra ialf-Ha'n ges arie" secured ltoc rime bran-itf eaeh havingy a *therextendiyng approxifsaidfSh-eF ,r

rising-' a; :air ofrlangle l l end adaptjin openingsfnuthe other said-radial ,flanges be- 

